Carriage tabulating means



Nov 23, 1950 v H. GANG 2,

CARRIAGE TABULATING MEANS Filed Feb. 16, 1948 12 Sheets-Sheet 1 kh mmtmmm [1/5 E [3E] 000000000000 0 a m J i fir lb INVENTOR ATTORNEY H GANG CARRIAGE TABULATING MEANS Nova 21, 1950 12 Sheets-Sheet 2 Filed Feb. 16, 1948 @cu ,QT AMbl/M m.

ATTORNEY- Nov. 21, 1950 GANG CARRIAGE TABULATING MEANS l2 Sheets-Sheet 3 Filed Feb 16, 1948 ATT RNEYS Nov. 21, 1950 H. GANG 2,531,204

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ATTORNEY- Nov. 21, 1950 H. GANG CARRIAGE TABULATING MEANS 12 Sheets-Sheet 5 Filed Feb. 16, 1948 INVENTOR 9W mfmwm Nov. 21, 1950 H. GANG CARRIAGE TABULATING MEANS l2 Sheets-Sheet 6 Filed Feb. 16, 1948 p m E v w A TTOIP/VE Y5 Nov. 21', 1950 H. GANG CARRIAGE TABULATING MEANS 12 Sheets-Sheet 7 Filed Feb. 16, 1948 lll ll INVENTOR C01m50a0n V301.

ATTO R N EY NOV. 21, 1950 GANG CARRIAGE TABULATING MEANS l2 Sheets-Sheet 8 Filed Feb. 16, 1948 Nov. 21, 1950 H. GANG CARRIAGE TABULATING MEANS Filed Feb. 16, 1948 12 Sheets-Sheet 9 ATTORNEXS Nov. 21, 1950 GANG 2,531,204

CARRIAGE TABULATINC MEANS Filed Feb. 16, 1948 12 Sheets-Sheet 10 A TTORNEYS Nov. 21, 1950 H. GANG 2,531,204

CARRIAGE TABULATING MEANS Filed Feb. 16, 1948 12 Sheets-Sheet 11 Fig/Z tCSb/hdT/IQUM ATTORNEYS Nov. 21, 1950 H. GANG 2,531,204

CARRIAGE TABULATING MEANS Filed Feb. 16, 1948 12 Sheets-Sheet 12 (mild/50mm Kim. ATTORNEYs Patented Nov. 21, 1950 UNITED STATES PATENT OFFICE CARRIAGE TABULATING MEANS Herman Gang, Livingston, N. J assignor to Monroe Calculating Machine Company, Orange, N. J a corporation of Delaware Application February 16, 1948, Serial No. 8,544

16 Claims.

. lating the carriage comprising clearout means for a register of the carriage.

Another object is to provide means for s tabulating the carriage comprising clearout means .for a plurality of registers adjustable selectively to clear one and/or another of said registers.

Other objects and advantages will appear hereinafter or will be obvious.

The invention consists in the novel construction and combinations of parts as hereinafter set forth in the claims.

In the accompanying drawings,

Figure 1 is a plan view of a calculating machine embodying the invention.

Figure 2 is a vertical section showing the keyboard and the carriage shift mechanism.

Figure 3 is a fragmentary elevation of portions of the carriage return mechanism in an'operative position.

Figure 4 is a right side elevation of the machine, with the parts in normal position.

Figure 5 is a fragmentary elevation of portions of the carriage return mechanism in an operativ position.

Figure 6 is an elevation and partial section of portions of the carriage shift and actuator drive and control mechanisms as viewed from the rear of the machine. I

Figure '7 is a detached fragmentary left side elevation of portions of the carriage shift and actuator drive control mechanisms.

Figure 8 is a left side elevation of the machine showing in part the differential drive mechanism and the controls therefor.

Figure 9 is an enlarged right side elevation showing portions of the controls for the clearout mechanism and the controls for the carriage r turn mechanism.

Figure 10 is a fragmentary view of the carriage shift keys shown in Figure 9, as viewed from the left.

Figure 11 is a vertical section taken just inside the left hand side frame of the machine, showing certain linkage for the clearout mechanism and means for raising and lowering the carriage.

Figure 12 is a left side elevation of the machine, showing the clearout clutch and the two phase carriage shift control clutch and certain associated mechanisms.

Figure 13 is a right side elevation of the carriage shift keys, the tabulator keys, and certain associated mechanism.

Figure 14 is a fragmentary view, showing certain parts illustrated in another position in Figure 13.

Figure 15 is a fragmentary rear view of the main carriage, showing the tabulator keys mounted thereon.

Figure 16 is a left side elevation of the machine, with the parts in normal position.

Figure 1'7 is a fragmentary view of portions of the clearout mechanism.

Figure 18 is a front elevation of the parts shown in Figure 17.

Figure 19 is a perspective view, with several of the parts in exploded relationship, of portions of the clearout and carriage return mechanisms.

Carriage shift mechanism The carriage shift devices herein disclosed embody the operational features substantially as set forth in Patent No. 2,419,760 to E. F. Britten, Jr. However, means for lifting the carriage to partly unmesh the intermediate gears in the carriage and body of the machine for clearance prior to initiation of a shift, are included. Furthermore, tabulating keys are provided whereby a shift may be terminated in a predetermined position during the time one of the shift keys is held depressed. Part of the tabulating means also functions in the performance of certain calculations to terminate the shift when the carriage has been shifted to one or the other of its extreme positions.

As herein disclosed and as set forth in the above mentioned patent, the means which control the extent and direction of actuator movement are utilized to control the extent and dire'cti'on of shift of the carriage 2 (Fig. 1). For this purpose, two friction clutches 352 and 353 are provided as shown in Fig. 6, the driving elements of these clutches being connected for rotation as a unit by a sleeve 354. The driving elements of clutches 352 and 353 are connected to the output gear 498 of the differential gear drive tween the driving member of the clutch and the (driven member Normally clutch 352, is held engaged under spring tension, connecting the drive to the actuators to the output of the differential.

Clutch 353, which is normally disengaged, has a driven member similar to member 356 of clutch 352 except that it is freely supported on shaft 353 and is provided with gearing connection 351. The carriage is mounted at its ends and center on the aligned shafts 453 and 461! which are slidably and pivotally mounted in the framing of the machine. Worm 358 is engaged by a spring plunger 353 depending from carriage 2, the carriage thus being shifted to the right or to the left upon rotation of the worm 358 in one or the other direction.

Sleeve 354 is moved to the right or to the left, and is held under spring tension in either shifted position, to engage clutch 352 or clutch 353 by means of a toggle arrangement best shown in Figs. 2 and 6 and fully disclosed in the aforementioned Patent No. 2,419,760. A shifting arm 366 is provided with anti-friction rollers engaging between flanges of sleeve 354, and is pivoted at one end to a link 351, having pivotal connection to the machine framing, and at the other end has connection with one link of a toggle 332, the far end of the other link of this toggle being also pivotally secured to a bracket rigidly mounted on a fixed shaft extending between the side frames of the machine. In normal position of the parts toggle 363 is fully extended, holding arm 366 against the tension of spring 350 in position to engage clutch 352, in which position the clutch is yieldably held engaged under the tension of a spring 364 connected to link 351. In order to disengage clutch 352 and engage clutch 353 means are provided for breaking the toggle 332, thereby allowing spring 363 to move sleeve 354 to the right as viewed in Fig. 6, in which position clutch 353 will be held engaged under tension of spring 363. For breaking the toggle, a shaft of one of the links thereof. Shaft 365 is rocke by depression of the ri ht shift key 359 or left i shift key 3111 (Figs. 1 and 9) as follows:

These keys 369 and 3123 are mounted in the machine frame closely adjacent to the plus bar 23 and minus bar 12! (Figs. 1 and 9). Right shift key 359 has a shoulder overlying a stud 331 carried by the stem of plus bar 126, and left shift key 316 has a shoulder overlying a stud 398 in the stem of minus bar I21, both keys extending downward and having slot and pin connection with a lever 368 (Figs. 4, 10, 13). Pivotally mounted on the rear end of lever 363 and spring biased toward the front of the machine is arm 361 provided with a shoulder 361 (Figs. 13 and 14) and at the free end thereof a plunger 438 the function of which will be later described. Fixed on shaft 365 extending through the frame of the machine is latch lever 439, the forward end of which is provided with a bent over portion normally overlying the shoulder 361. on arm 361 and a nose portion to the rear which acts as a stop by contact with shaft 426. Depression of the right shift key 369 will, therefore, effect depression of the plus bar 120, effecting additive drive from the differential to the driving members of friction clutches 352 and 353 and conversely negative drive from the differential will be effected by depression of the left shift key 316 which will effect depression of the minus bar I21. At the same time, depression of either:

of these shift keys will depress the forward end of lever 368 (Fig. 13) and raise its rearward end with the arm 361 attached thereto. This movement will rock latch lever 439 and shaft 365 clockwise by contact of shoulder 361' with the bent over portion of said lever, breaking the toggle 362 and engaging shift clutch 353 at which time clutch 352 is disengaged. Although drive to the shift worm 358 is thus effected, clutch 352 will slip momentarily and the worm 358 will be held locked against rotation while a one cycle clutch 31! (Figs. 12 and 15) makes a partial rotation comprising a relatively short step in the cycle to effect lifting of the carriage 2 to provide clearance during the shift as follows:

When toggle 362 is broken to initiate a shift, a slide 316 (Fig. 6) connected to a crank extension of one of the toggle links 362 will be moved to the right. The end of the slide 315 has slot connection with the upper arm of a bell crank lever 446 the other arm of which has link connection to one arm of another bell crank lever 44! (Figs. 12, 16). The depending arm of bell crank lever 441 engages a detent 442 which is spring urged to normally engage a pawl of clutch 31!, holding it disengaged. The clutch is driven through suitable gearing by the electric motor 1. Upon movement of slide 316, the bell crank lever 446 Will therefore be rocked and accordingly the bell crank lever 44!, will also be rocked which will lift detent 442 against tension of spring 453 out of engagement with the pawl of clutch 31l to engage the drive. A second detent 313 normally rests against the periphery of the driven member of clutch 31! and has pin and slot connection with tripping arm 381. A spring 450 urges arm 38! counterclockwise and thus detent 3'5 3 in the same direction. An upwardly extending arm of the detent 313 is provided with a roller which normally engages a slot in the disk 386 secured to a sleeve which is splined to shaft 319 of the shifting worm 358. Thus the worm is held against rotation until the clutch 311 has rotated a distance which allows the detent 313 to engage the pawl of clutch 311 and interrupt the drive (Fi '1). When the detent 313 moves inwardly to disengage the clutch 31 the upwardly extending arm of the detent disengages its roller from the slot in disk 385, permitting the engaged shift clutch 353 to drive the shifting worm 358.

The above described step in the cycle of rotation of clutch 31! effects lifting of the carriage 2 through a cam 443 (Figs. 7 and 16) secured to the driven member of the clutch. A link 444 provided with a roller at its upper end in contact with the cam 443 and guided by a slot in the framing'of the machine is moved downwardly by rotation of said cam (Fig. '1). Link 444 is attached through pin' and slot connection to the end of arm 445 (Fig; 16) fixed on a shaft 446 extending across the machine. Downward movement of link 444 will thus rock shaft 446 counterclockwise, Fig. 16, and clockwise (Fig. 11) against the tension of a spring attached to arm 458 fixed on said shaft (Fig. 4). Fixed on shaft 446 is a pair of arms 441 (one of which is shown in Fig. 11) having link connection 448 with a pair of carriagev lifters 449. The carriage lifters are provided with slots at their forward ends by which they are pivotally mounted on pins on the inner sides of the right and left side frames respectively of the machine. The rearward. ends'of the lifters 448 are provided with hook end portions adapted to fit under and over an inwardly turned shelf located at the front of and extending the length of the carriage 2.

Rocking of shaft 446 will, therefore, raise arms 441 and through the link connections raise the carriage lifters, thereby lifting the carriage, which is pivotally mounted at its rear, to partly unmesh the intermediate gears in the carriage from those in the body of the machine. As wil be readily understood, the carriage will be in sliding engagement with the lifters during the shift, at which time said lifters perform the function of supports and guides. Also, it will be seen that the lift cam 443 is arrested in its rotation (Fig. 7) in position to hold the carriage in raised position during the shift, which will be continuous as long as a shift key is held depressed; or until the carriage has been shifted into a position in-- dicated by a set tabulating key 402 (Fig. or to either of its extreme positions, as will be hereinafter described.

Reease of shift key 369 or 318 will bring about the termination of the shift, whereupon the onecycle clutch 311 will complete its cycle for the purpose of normaliz'ng the several parts. To this end, when toggle 362 is broken to initiate a shift, adjustment of the mechanism takes place as follows:

When toggle 362 is broken, slide 316 (Fig. 6) is moved to the right, as heretofore described, carrying an arm 311 integral therewith out of restraining engagement with a disk 318, fixed upon a sleeve which is splined to the shaft 319 of the shifting worm 358. Disk 386 secured to the opposite end of this sleeve is provided with a pin 388 (Figs. 7 and 16), normal'y lying to the left of tripping arm 38L pivotally mounted with clutch detent 313 on a common shaft. The detent 313 and tripping arm 38| have pin and slot connection, and an upstanding arm of the detent and the tripping arm have attachment to the respective ends of a spring 45], which urges them towards each other to the limit of the pin and slot connection. As heretofore described, the arm of the detent 313 has a roller which normally engages a slot in d'sk 386 and is removed therefrom when the detent acts to arrest the rotation of the clutch 31l following its engagement by lifting the detent 442 from engagement with the 6 and putting detent 313 under tension of spring 45!, thereby biasing the roller of the arm of said detent against the periphery of disk 386. This relative movement between the tripping arm 38! pawl of the clutch. A spring urges disk 318 and a the associated parts towards the right (Fig. 6), but the disk is restrained, after the removal of the restraint of arm 311, by engagement with a crank arm 383, more clearly shown in Fig. 8. Crank arm 333 is secured upon shift initiating shaft 365, which is rocked upon depression of a shift key and thus rocks the arm 383 into the path of movement of the disk 318. As movement of the disks 318 and 386 to the right acts to terminate the shift, restraining crank arm 383 provides for continuous shifting until the carriage has reached a postion indicated by a set tabulator key 482; or to an extreme position; or until the shift key is released.

Upon release oi the shift key, shaft 365 will be restored by counterclockwise rotation of latch lever 433 (Fig. 4), under the influence of spring 452, thereby removing crank arm 383 from the path of disk 318. Spring urged disk 318 will now move to the right as viewed in Fig. 6, and with it disk 386 and pin 38!! until blocked by contact with tripping arm 38L As shaft 318 of worm 358 completes its cycle of operation, pin 380 will contact one of the two opposed cam faces of tripping arm 38I (Fig. 7.), rocking said arm clockwise against the tension of spring 450 and detent 313 is allowed by the pin and slot connection therebetween. As this movement reaches its maximum, the shift worm reaches its full cycle position, at which time the slot in disk 386 is in registration with the roller on the arm of detent 313 and said roller is urged to enter the slot by tensioned spring 45l. In order to insure this action and prevent the worm from running past full cycle position, tripping arm 38! is provided with an extension 381 (Figs. 6 and '7) When the tripping arm is moved by pin 380, the extension 381 is moved into the path of a pin 388, which is fixed in a disk rotating with shaft 319, thereby preventing movement of the shaft beyond full cycle pos tion. As the shaft may be rotating in either direction, pin 388 may engage extension 381 on either side thereof, for which reason is disk to which pin 388 is fixed has pin and slot lost motion driving connection with gear 351, fast on shaft 319. When the roller on the arm of detent 313 enters the slot in disk 386, said detent is removed from engagement with the pawl of clutch 31l, permitting the reengagement of the clutch to complete its cycle of operation to normalize the several parts. In this connection, it will be noted that the toggle 362 must be reset to disengage the friction clutch 353 and engage clutch 352 and that the clutch lever Ill (Fig. 8) must be disengaged. Also the carriage must be lowered to its normal position. Furthermore, it will be observed that, although the plus or minus bar is depressed and released with the related shift key, arm 22 will not rock during a shifting operation, and therefore the tripping of the trigger 3|, as the plus or minus bar is released, Wil be ineffective. Disengagement of clutch lever HI, lowering of the carriage and resetting of toggle 382 is accomplished by the clutch 31l asfollows:

The clutch 31! is provided with cams 312 and 39l secured to the driven member of said clutch. Upon rotation of clutch 31] in its second step of movement, cam 39! (Fig. 7) will engage a roller on an arm of bell crank lever 44l, rocking said lever counterclockwise, thereby through the link connection rocking bell crank lever 448 counterclockwise (Fig. 6) to move the slide 316 to the left and reset the toggle 362. Also detent 442 will now he urged inwardly by spring 453. When slide 316 is moved to the left, disk 386 and pin 389 are removed from engagement with tripping arm 38!, allowing the arm to be rocked counterclockwise by spring 456, urging detent 313 through the pin and slot connection, against the periphery of the driven member of the clutch 31!, In this connection, it will be noted that the roller on the arm of the detent 313 will be moved outward from the bottom of the slot in disk 385 but not removed, thus holding the shift worm 3558 in locked full cycle position (Fig. 16). During this second step of rotation of the clutch 3*, the clutch lever II! will be restored to its neutral position by operation of cam 312. To this end, arm 454 (Figs. 12 and 16), pivotally mounted to the frame of the machine, is provided with a roller held in contact with cam 312 by action of a spring attached to said arm. A second arm 2-55 having common pivotal mounting with arm 454 is provided with a latch 456, the upstanding end of which is normally in the path of movement of a pin in arm 454, so

that arm 455 will be rocked in unison with arm 454. Arm 455 will, therefore, be rocked clockwise (Figs. 12 and 16) upon rotation of clutch 31! in its second step of movement. An upstanding extension of arm 455 will thus contact a lug on link 424 attached to the full. cycle arm 24 at its forward end, and move the link toward the front of the machine, thus rocking arm 24 clockwise about its pivot, raising the cam extension !44 (Fig. 8) into contact with the pin !45 of clutch lever and thereby centralizing the clutch lever. At this point, it will be noted that the circuit breaker to the motor has been broken, and although clutch 37! has not yet reached its full cycle position, cams 312 and 39! have completed their work and the clutch through momentum will be free to coast to the completion of its cycle, where the drive will be disengaged by detent 442. Also, clutch 353 is still in'engageinent when the shift worm 358 is stopped and therefore a momentary slippage of the clutch will take place as toggle 362 is being reset. Furthermore, as the clutch 3'1! completes its cycle of operation it will be seen that the cam 443 will allow the carriage 2 to be lowered to its normal position under the urge of sprlng 45? (Fig. 4).

Carriage shift (last place stop and tabulating keys) Should the right shift key 339 or left shift key 373 be held depressed until the carriage is shifted into either of its extreme positions, shift initiating shaft 365 will be restored to normal, whereby the drive is terminated in manner as described when the shaft 355 is restored to normal upon release of the shift key. For this purpose, two lugs 463 (Figs. 4, 13, 1e, 15) are located on the rear of carriage 2 and so spaced that the nose of plunger 433 mounted on arm 33'! is positioned just below one or the other of the lugs when the carriage is in either of its extreme shifted positions. Should the carriage be in the extreme right hand position, for example, and the left shift key be depressed (Fig. 13), the plunger, which is spring urged to its normal position (Fig. 4), will be depressed by contact with the lug 459 when arm 35? is raised and the shift initiated. When the carriage has shifted from the extreme right hand position, the lug 469 will be removed from contact with the plunger 433 and said plunger will be spring urged to its extended postion. As the carriage is shifted into the extreme left hand position, the nose of the plunger will ride outward on the inclined cam edge 46!) of the lug 439, thus moving arm 33! to the rear against the tension of its spring (Fig. 14). This movement of arm 35! will remove shoulder 35"." from restraining engagement with latch lever 439, a'lowing the lever and rock shaft 355 to be spring urged counterclockwise to normal and thus open the carriage shift clutch and terminate the shift. When the shift key is finally released, the plunger 438 will drop below lug 468 and arm 33'! will be urged forward by its spring, locating the shoulder 35? in its normal position below the forward end of latch lever 439 (Fig. 4). Termination of the shift at the extreme position in the opposite direction is, as will be readily understood, accomplished in the same manner. Should a shift key be depressed while the carriage is in the extreme position of the indicated shift, a shift will be initiated, but as the plunger 359 is at the end of the worm 358 the drive will the same be ineffective to move the carriage. However, the plunger 359, which is spring urged within the groove of the Worm 358, will be raised to ride over the outer diameter of the worm by the eccentric conformation of the worm at either end, as will be seen in Figs. 2 and 6.

The tabulating keys 402, one for each order intermediate the extreme right and left hand carriage shift positions, are located on the rear of the carriage intermediate the lugs 46!) (Fig. 15). The lower end 46! of each key 402 is bent outwardly from the carriage to form 2. lug at substantially the same angle as the lugs 460, and is provided with a pair of oppositely inclined cam edges which are adapted to displace plunger 438 in the same manner as described in connection with the inclined cam edges 460' of the lugs 46!). In the unset position of the keys 402, the end lugs 46! are raised above and out of range of the plunger 438 when a shift key is depressed. However, when one of the keys 402 is depressed, its end lug 43! is brought into the same plane as the lugs 460 and should the carriage be shifted either to the right or left the arm 36'! will be displaced pivotally against the tension of its spring by contact of the nose of the plunger 438 with one or the other of the cam edges of the lug 46! of the set tabulator key to terminate the shift in the same manner as that previously described in connection with the lugs 460 of the carriage. It will be noted that upon termination of the carriage shift said arm 36'! will be held in rearwardly displaced position by contact of the nose of plunger 438 with the lug 46! of the set key. However, upon release of the shift key said arm 35'! will be restored by its spring, shoulder 36'! of said arm will be located below the forward end of latch lever 439 and said plunger 438 will be located below the lug 48! of the set key. The plunger 438 being thus restored to normal lowered position and the carriage being still located in the order indicated by the set tabulator key, upon depression of either shift key and consequent raising of Said arm 361, the plunger 438 will be depressed against the tension of its spring by contact with the overlying lug 4B! of the set key so that there will be no interference with the raising of the arm 361 in initiating the shift. The carriage being thus shifted into a new order, the lug 46! of the set key will no longer overlie said plunger 438, which latter will be restored to normal extended position by its spring and thus conditioned to contact one or the other of the end lugs 46!] of the carriage to terminate the shift in either extreme position thereof. As will be noted in Fig. 15, a depressed key 402 is latched in set position by a lug 462, one of which is provided for each key on slide 462 which is spring urged to the left. Upon depression of one or the other of the tabulator keys 402 and before it is latched, an inclined edge of the key stem will, by contact with its lug, cam the looking slide 462 to the right, allowing the previously set key to be restored by a suitable spring to normal. An additional key 453 is provided which functions in like manner to unset anyone of the tabulator keys 492, thereby providing for extreme shift in either direction.

Upper dial, lower dial and keyboard clear-out mechanism The machine is provided with a one cycle clutch 464 (Figs. 12 and 16) which is selectively operated to return to zero the upper dials comprising the multiplier-quotient register, the lower dials l3 comprising the dividend-product register (Fig. 1), or to restore keys 18 which may be set on the keyboard l9. An upper dial clear key 465, a lower dial clear key 461 and a keyboard clear key 466 are grouped on the lower right hand side of the keyboard I9 (Fig. 1). A fourth key 468 completes the key grouping and is adapted for simultaneous depression with the keys 465, 466 and 461 to initiate certain machine operations hereinafter described. The depression of any one of the keys 465, 466, or 461 serves to engage the clutch 464 and to select the operation it will perform. The keys, however, are adapted to be depressed simultaneously, whereby the clutch 464 will operate a single cycle to simultaneously clear the indicated dials and/or keyboard as follows:

Each of the stems of the clear keys 465, 466 and 461 is pivotally connected at its lower end to the forward ends respectively of levers 469, 419 and 4H which are fulcrumed, one behind the other, at their rear on a stud 412 fixed on the right hand side frame. Lever 41! is shown in its entirety in Fig. 9 and levers 469 and 419 are of like configuration. The levers 469, 410 and 411 are provided with depending arms which terminate in horizontally disposed fingers 469, 410' and 411 respectively, which are adapted for contact each with an arm of bell crank levers 413, 414, and 415 respectively. The bell crank levers are fulcrumed on a vertical shaft 416 (Fig. 18), suitably fixed and depending from a cut-out section of the right hand side frame. The bell crank levers 413, 414 and 415 are pivotally connected to slides 411, 418 and 419 respectively, which sldes extend across the machine (Figs. 1'1, 18 and 19). Thus depression of any one of the clear keys 465, 466 or 461 will rock its associated lever counterclockwise (Fig. 9) about the stud 412 and the finger 469', 419 or 41! will rock bell crank lever 413, 414 or 415 counterclockwise, thus moving slide 411, 418 or 419 to the left. The movement of any one of the slides to the left either singly or simultaneously with either one or both of the other slides releases a double latch 482 (Fig. 17) which allows the clearout clutch 464 to be engaged and selects the operation or operations to be powered by the clearout clutch. The double latch 482. which is normally in engagement with a shoulder 469' of a slide 489 (Figs. 12 and 1.7), holds said slide in its rearward position against the tension of a spring 48!. The slide 489 is slidably supported at its forward end on a shaft 484 which extends across the machine and projects externally of the left hand side frame, and is pivotally connected at its rearward end to an arm 485 fixed on shaft 486, which shaft is rotatably mounted in the side frame. The leftward ends of slides 411, 418 and 419 are in abutment with an upstanding ear 482 of latch 492 (Figs. 17 and 18). Thus movement of one or more of the slides to the left will rock latch lever 482 clockwise about its fulcrum against tension of spring 483, releasing slide 489, which will be pulled forward by its spring 48!. The left hand ends of the slides 411, 418 and 419 are each prov ded with a recess and when a slide 411, 416 or 419 is moved to its active position, the forward end of released slide 489 will enter such recess and hold the slide 411, 418 or 419 in set position until the engaging end of slide 480 has been removed, when said slide 411, 413 or 419 will be restored to latched position. Clear-out 10 clutch 464 is driven by a suitable gear train 463 from the electric motor and is of well-known construction in which a spring pawl mounted on the driven member of the clutch is held out of engagement with the driving member by a detent. For this purpose a detent 48'! (Figs. 12 and 16) is fixed on shaft 486 and when the slide 489 is released and pulled forward by its spring, the shaft 496 through arm 485 will be rocked counterclockwise, thus removing detent 481 from engagement with the pawl of clutch 464, thereby engaging the drive to the motor. The detent 481 is provided with an extension 488, the free end of which is provided with an open-end slot which is adapted for engagement with a pin 489 (Fig. 8) on clutch lever Ill when the detent is disengaged and the clutch lever is in neutral position. Thus it will be seen that if a clear-out key 465, 466 or 461 is depressed while the clutch lever I i i is in either of its active positions, the clear-out clutch 464 will not be disengaged, as the extension 468 will be blocked by contact with the pin 489, thus preventing detent 481 from disengaging the pawl of the clear-out clutch. However, extension 488 is allowed a degree of movement insufficient to disengage detent 431 before being blocked by pin 469 but sufficient to allow slide 489 to move forward far enough to carry shoulder 489' past the restraining arm of latch 482. Furthermore, the forward movement of slide 489 is sufficient to carry its forward end into partial latching engagement with the recess of the operated slide 411, 418 or 419. Thus it will be seen that even though a depressed clear key 465, 466, or 461 be released while the clutch lever I ii is engaged, when said lever III is returned to neutral, the slide 489 will complete its forward movement to cause engagement of the clear-out clutch 454. Upon engagement of the clear-out clutch the circuit breaker for the electric motor must be closed. For this purpose, a lever 499 (Fig. 8) fulcrumed on the frame is urged counterclockwise by a suitable spring. A horizontally disposed arm of the lever 499 is in contact with a pin on the arm 299 (Fig. 8) and the lever is.

restrained from rotation by a lug 49l on the slide 499 in blocking contact with a depending arm of the lever 499. When the slide 489 is released to move forward, the lever 499 is urged counterclockwise by its spring and the forward end of lever 299 is lifted to close the circuit breaker.

In order that the clutch 464 shall make one cycle of operation and then be disengaged, provision is made to return the detent 481 into position to engage the pawl of the clutch before the clutch has completed its cycle. To thi end, the detent 491 is provided with an extension 4922 (Figs. 12 and 16), the free end of which is provided with a cam face 492'. When the detent 481 is disengaged (Fig. 12), the free end of the arm 492 is moved downwardly, thus bringing the cam face 492 into position to be engaged by a pin 493 mounted on the dr ven member As the clutch 464 approaches,

ll cam face 492, provid ng sufficient movement to bring the shoulder 480 of the slide 480 to the rear of the restraining arm of latch 482, which will be urg d into latching position by spr ng 483. The slide 488 will then be urg d forward by its spring into contact with the latch 482 and the arm 492 moved slightly downward (Fig. 16). The latch 482 operates as above descrbed only if the clear-out keys 485. 468 and 43'! have been released before the complet on of the clearout cycle. If the clear-o t keys have been released. the ear 482' abutting the ends of the setting slides 41?, 478 and 479 will move sa d slides to the right to t e r unset position. However, should a clear key be held depressed a setting slide will be held to the let and by contact with ear 482' hold the latch in clockwise rocked position out of the path of the shoulder 480' of sl de 480 (Fig. 17). In this instance, a latch lever 494 hav ng a common fulcrum with latch lever 482 will be urged clockwise by spring connection with latch lever 482. thus positioning it in the path of the shoulder of sl de 480 and preventing forward movement of the slide. When the clear-out keys are released, the latch lever 482 will then be free to be moved counterclockwise by spring 483 and return the slides 411. 418 or 419 to normal. As latch lever 482 is moved coun erclockw se it wll. by contact with latch lever 494. Irove the atter out of 1 latching engagement with slide 480 and itself be moved into latching position, thereby restraining said slide 480 from forward movement (F'g. 1'7) The clutch 45 du ing the forgoing cycle of operation, provides the po er to *erate the mechanism adiusted o act've postion by one or more of the setting si'i s 411, 418 and 419. To this end. the driven m mber of the clutch 484 is provided with an ecce tric cam 495 Fig. 16). The eccentric cam is ada t d to impart a reciprocatory movement to a link 490 (Fig. 16) which is pivotally conn cted at its forward end to a crank arm 49'! w ich is fixed on the shaft 484 w ich extends across the machine (Figs. 17 and 19) Thus when clut h 48 is engage the shaft 484 is rocked clock" ise (Fig. 16), counterclockwise (Fig. 19), durin th first half of the cycle and during the second half of the cycle is rocked back to normal.

Slidably mounted on sh ft 484 and ositioned to the left of the right hand side frame, is a rearwardly extend ng lever 498 (Fi s. 17 and 19) having a pin 499 att nding to the l ft thereof. Integral with lever 498 and positioned to the left in spaced relationshp thereto is a member 500 provided with an upstanding port on having an open-end slot. Further to the left and fixed on shaft 434 is a collar 59| provided with an arm 502 extending to the right thereof and seated in the open-end slot of member 500. Fulcrumed on shaft 485 is a lever 598 (similar to lever 509, Fig. 2), the forward end of which is provided with an open-end slot the bottom of which is defined by an ear 503 which is offset to the right (Fig. 17). Normally the forward end of lever 508 is held downwardly by a rearwardly extending finger *:2 (Fig. 19) of the extension 502 of collar 50L the pin of lever 498 being nositioned just above and out of contact with the ear 503'. However, depression of clear-out key 455, which will initiate the operation which will restore the upper dials 85 to zero, will, as heretofore described, move setting slide 411 to the left. Slide 471' (Fig. 17) is provided with a projectionv 12' 41'! (Figs. 1'7 and 19) having an open-end slot which engages the rim of member 500. Thus member 509 and lever 498 are moved to the left and the pin thereof into engagement with lever 503 through the slot in the forward end thereof. When shaft '81 is rocked by clearout clutch 454, arm 4'8 w'll therefore be rocked through arm 502 of collar 59!, thus raising the forward end of the lever 513. The rearward end of lever 593 is pivotally connected to the lower end of a link 504 (Figs. 2 and 19) which latter is pivoted at its upper end to an arm 595 (Fig. 2) s lined on the carriage shaft 459 and provided with a suitable bearing in the right hand side frame of the machhe (Fig. 2). Thus as the rearward end of lev r 593 is lowered shaft 460 wi l be rocked clockwise and through suitable linkage 500, shaft 59! mounted in the carriage will likewise be rocked clockwise. The rocking of shaft 50' will serv" to return to ze o the cycle counting wheels (Fig. 1) in the manner fully d'sclosed in Patent No. 1,781,320 to L. P. Crosman. As shaft 484 is rocked clockwise back to normal, the pin of arm 49! (Fig. 17) by contact with ear 503 will move the forward end of lever 503 downwardly and at the end of the movement the finger 502 will further depress said lever, lowering ear 593' slightly below the pin of arm 498, at which time side 41'? will be restored to its normal position i key 465 has been released. However, if key is held d-pressed, the restoration of the slide 41! will take place upon release of said key. Should one or the other of the setting slides 418 or 419 be moved to the left to initiate a cycle of clear-out clutch 464 while slide 471 is in its normal position, the rock ing movem nt of arm 498 will be ineffective to clear the cycle counting wheels 85, as the pin of said arm is out of enga ement with the slot in the forward end of lever 503.

The parts adjusted to active postion by depression of key 467 and l ftward movement of slide 419 for clearing the lower dials l3 to zero are of s milar co striction to that for the upper dials 85. An arm 508 on shaft 494 (Figs. 2, 17, and 19) provided with a pin, is moved on said shaft into engagement with a lever 509, said lever being actuated by an arm of a collar 510 which is fixed on shaft 494. The rearward end of lever 599 is pi otally connected to a link 5! l (Figs. 2, 11 and 12) which link is pivotally connected to an arm 512 spli'ned on the carriage shaft 459, and provided with a suitable bearing in the left hand side frame 0 the machine. Hence, when shaft 459 is rocked clockwise (Fig. 11), shaft 5l3 will, through suitable linkage 5l4 li ewise be rocked clockwise and the totalizer wheels [3 (Fig. 1) be zeroized "n accordance with the abovementioned Patent No. 1,781,320.

As it is necessary that the intermediate gears in the carriage be out of mesh with the intermediate gears in the machine body (Fig. 16) when wheels 13 are cleared, a clear-out cycle of clutch 4B4 operates to raise the forward end of the carriage. A cam 522 (Fig. 16) rotated with the driven member of clutch 464 serves to depress an arm 523 at the beginning of a clear-out cycle. Arm 523 is fast on shaft 448 and as said shaft is rocked counterclockwise, the carriage 2 is lifted through arms 441, links 449 and lifters 449 (Fig. 11) in the same manner as previously described in connection wth carriage shifting. As clutch 464 approaches its full cycle position, arm 523 is allowed to move upwardly as spring 451 connected to arm 458 of shaft 446 (Fig. 4)

13 Y pulls the carriage downwardly into its normal position.

The depression of the clear-out key 466 will initiate the operation to clear the keyboard IQ of values which may be set up by depressed keys l8 as follows:

The keyboard construction is of the well known type in which a set key If! in any order is latched in depressed position by a bail 432 (Fi 2) and in which the depression of another key in that order will move the bail to release the set key, the key which is now depressed being in turn latched in set position by said bail. Accordingly, provision is made to simultaneously depress the row of keys 18 extending across the front of the keyboard, one being provided for each order. Depression of these keys l8 which designate a zero value serves only to move the bails 432, thereby releasing the set keys in each order, allowing the setting slides 16 (Fig. 2) to return to normal and removing the values which may be set up on the actuator gears 5. The stem of each of the zero keys l6 terminates at its lower end in a horizontally disposed portion (Fig. 2). Extending across the machine is a bail 515 pivotally mounted on a shaft H5.

The rearward edge of bail 5|5 overlies the horizontal lower ends of the zero keys [8 and is in contact therewith when the keys are in released position. Thus, it will be seen that when bail 5l5 is rocked clockwise the zero keys 18 will be depressed, thereby releasing the value keys l8 which may be set in each order. The zero keys 18 will then be held in latched position by the balls 432. The bail 5l5 is provided at its right hand end with a depending arm 51'! (Fig. 9) adjacent the inner wall of the right hand side frame. link 5:8 (Figs. 9 and 19) is pivotally connected to the arm 5H and extendsrearwardly and in sliding contact with the inner wall of the right hand side frame. Mounted on the rear end of link 5l8 is a stud 5|9 extending through a horizontally disposed slot in the side frame and provided with an enlarged head which prevents lateral displacement of thelink 538. The stud 5I9 is normally urged against the rear end of the slot in the side frame by a spring 526 (Fig. 9) through link 5i8 which is connected to the lower end of arm 5|! of bail 5l5. thus maintaining said bail in its normal unrocked position. The shaft 484 extends through the right hand sic'e frame externally thereof and is provided with a squared end portion upon which is slidably mounted a member 52i (Figs. 9 and 19) Member 52! is provided with an upstanding lug 52 l normally positioned to the right and rear of the head of stud 519. Clear-out slide 418 exten s to the right beyond the side frame and terminates in a rearward projection provided with a slot which engages the rim of member 52!. Therefore, when the clear-out key see is depressed and slide 4' 8 moved to the left, the lug 52 l of the member 521 will be brought into the plane of the head of stud 5). As the shaft 484 is rocked counterclockwise by action of clear-out clutch 454, member 52! is also rocked and lug 52f will contact A push the head of stud 5!!) moving it forward in the Tabulating keys It will be noted from an inspection of the drawings (Figs. 4, 13, and 14) that the operating connection between latch lever 439 and latch arm 351 permits movement of lever 436 and the parts connected therewith to shift initiating position i dependently and without displacement of arm 361. As fully cisclosed in applicants co-pending application, Serial No. 8,548, such independent movement is effected in the shift initiating operations incident to programs of multiplication and division. It will be apparent, therefore, that any set tabulator key (262 will be effective to interrupt a shifting operation only when initiated by depression of the shift keys which operate to move plunger 438 of arm 361 into the path of the lug of the set tabulator key.

In the calculation of problems in division, it is often desirable to begin a calculation with carriage 2 positioned intermediately of its extreme positions. Accordingly provision is made for shifting the carriage to the right to the desired position indicated by a set tabulating key 402. The shift is initiated by automatic depression of right shift key 669, and therefore when carriage 2 is shifted to the position indicated by the set tabulating key 462, the shift will be terminated. The foregoing is accomplished as follows:

A clear-out cycle of clutch 464 (Fig. l) initiated by the simultaneous depression of any one or more of the clear-out keys 465, 466 and 461 with key 468 (Fig. 1) will automatically bring about depression of right shift key 369. However, as it is desirable to clear the multiplier-quotient register 85, product-dividend register I 3, and keyboard in for the setting of the factors and registration of the result of the calculation to be performed, the simultaneous depression of keys 465, 466, 461 and 468 would be-the logical operation. To facilitate this operation, the keys are grouped at the right hand corner of the keyboard (Fig. 1). It may be well to note at this point that the depression of key 468 alone will not effect the carriage shift operation as will presently appear.

A slide 595 (Fig. 19) is adapted for two settings; namely, right shift and left shift. However, for the purpose of the present disclosure. the operation is described in connection with the right shift setting as shown in the drawings, and the means whereby the setting of slide 595 is accomplished forms no part of the present invention. Also, it will be reac'ily understood that when slide 595 is set for left shift, the operation hereinafter described will bring about a left shift and the shift will be terminated in the position indicated by a set tabulating key 402.

Slide 595 is mounted on the inner face of the right hand side frame of the machine. Mounted (or anchored) on the rear end of and extending downwardly from slide 595 is the tightly Wound coiled spring 596 (Fig. 19). The lower end of spring 596 is not anchored but extends downwardly through a hole located at the end of an inwardly extend ng arm of a rocker 59f. Rock'r 591 is pivotally mounted on a bracket (Fig. 9) which is mounted on the outer face 0}" the right hand side frame, and its inwardly extending arm, which has connection with spring 596, passes through a suitable opening in the side frame. Rocker 591 is adapted to be rocked in a plane substantially parallel to that of the keyboard, but is normally held in its central position by a lever 598 constituting 9, primary latch (Fig. 4). Lever 598 is fulcrumed on stud 594, which extends outwardly from the right hand side frame, and said lever is provided at its rearward end with a recess 598' in the lower edge thereof. When the rearward end of lever 598 is held downwardly in its normal position by spring 599 (Fig. 4), an

15 outwardly extending arm of rocker 591 is positioned within the recess 598', thereby preventing rocker 591 from being moved from its central pos'tion.

A lever 600 (Figs. 9 and 19), for a purpose to be described, is fulcrumed on the outer face of the right hand side frame at 600 and is provided with a downwardly extending arm which terminates in an inwardly bent portion adjacent the inwardly extending arm of rocker 591 and has slot connection with the lower end of spring 596. Lever 690 is further provided with a rearwardly extending arm which by contact with a lug 69! of a stop 601 (Fig. 19) will prevent said lever from counterclockwise movement when carriage 2 is in the extreme left hand position and from clockwise movement by contact with a lug 60!" of said stop when the carriage is in the extreme right hand pos'tion. However, when carriage 2 is in an intermediate position, stop 60! will be centrally positioned with lugs 60! and 601" at opposite sides of lever 600 and will be ineffective to prevent movement of said lever in either direction, as will hereinafter be described.

From an inspection of Fig. 19, it will be seen that the upper end of sprin 596 is displaced to the left of the lower end of the spring which has connection with rocker 591 and lever 600. Therefore, rocker 591 (Fig. 19) will be urged in a counterclockwise direction and lever 600 in clockwise direction as spring 596 tends to assume a straight line position to the left. However, rocker 591 is restrained from movement by the recess 598' of lever 598, and spring 596 will remain at this time with ts lower end displaced from alignment with its upper end.

In connection with a clear-out cycle initiated by depression of keys 465. 466 or 461 as described, shaft 484 (Figs. 9 and 19) is rocked couterclockwise, and then clockwise back to normal, the clockwise movement being effective to clear the ind'cated wheels or keyboard. A crank arm 602 (Figs. 9 and 19) fixed on shaft 484 has yieldable link connection 603 with a depending crank arm 604 (Fig. 9) which latter is integral with a rearwardly disposed hub of an arm 605. The hub of arm 605 is provided with a circumferential slot and is rotatably mounted and adapted for lateral dsplacement on a stub shaft 606 extending outwardly from the right hand side frame. A pin in the end of a forwardly extending arm of rocker 591 is positioned in the slot of the hub of arm 605. Thus it will be seen from an inspection of Fig. 19 that when rocker 591 is rocked in either direction, arm 695 wll be moved laterally either to the right or the left on shaft 696. The forward end of crank arm 605 (Figs. 9 and 19) is normally positioned between and laterally spaced from lateral pins 399' and 310 which are located in the lower ends of the stems of the right and left carriage shift keys 369 and 310 respectively. Thus, when a clear-out cycle is initiated by depression of one of the keys .65, 466 or 461, shaft 484 through crank 602, link 693 and crank 694 will rock arm 695 clockwise (Fig. 9) to a position above pins 369 and 319' and back counterclockwise to normal without contacting the said pins. However, when key 468 (Fig. 4) is depressed simultaneously with keys 465, 466 and 461 to effect a right carriage shift operation, a lever 601 having pivotal connection at its forward end with the lower end of the stem of key 468 is rocked counterclockwise about its fulcrum on shaft 594. Lever 601 is disposed to the rear of lever 59B and has at its rearward end a forwardly 16 extending lug 601' (Figs 4 and 5) which underlies and is normally in contact with the lower edge of lever 598. Thus when lever 601 is rocked counterclockwise, lever 598 is likewise rocked by lug 691.

A secondary latch 6H (Figs. 4 and 5) is provided to hold latch lever 590 in rocked position during the clear-out cycle which will initiate the carriage shift. This is necessary, as release of key 468 (Fig. 4) prior to completion of the clearout cycle would allow recess 598' of lever 598 to reengage the arm of rocker 591, thus holding the rocker n its central position and prevent the initiation of the carriage shift as will appear. Bell crank levers 413, 414 and 415 respectively (Fig. 19) are rocked counterclockwise upon depression of clear-out keys 465, 466 and 491 as described in connection with the clear-out operation. Outwardly extending arms of the bell crank levers are th s moved to the right (Fig. 5) and by contact w'th a depending arm of a lever 6l2 will rock the lever counterclockwise about its fulcrum aga nst the tension of a suitable spring. Lever 6|2 is provided with another arm which has spring connection with a forwardly extending arm of latch 6H. Thus, when lever 598 is rock d, secondary latch 6H (Fig. 5) will be urged clockwise beneath lug 610, holdng primary latch lever 598 in rocked position when lever 601 (F gs. 4 and 5) is restor d upon release of key 468.

When primary latch ever 598 (Fig. 5) has been so rocked, recess 598 is removed from restraining engagement with the outwardly extending arm of rocker 591. Spring 596 (Fig. 19) which is conditioned to move rocker 591 in a count rclockwise direction and lever 000 in clockwise direction, will act accordingly. However, as rocker 591 through its pin connection with crank arm 605 moves said arm laterally to the right (Figs. 10 and 19) on shaft 606, no appreciable movement is effected as the rightward lateral face of arm 605 is brought into abutment with the free end of pin 369' of the stem of the right shift key 359 (Fig. 10). As shaft 484 (Fig. 9) is rocked counterclockwise in the clear-out operation, arm "-05 is rocked clockwise by the link connection 603, whereby the arm is raised above the pin 369' of right shift key 369. Accordingly, arm 695 is a lowed further movement laterally to the right until restrained by the stem of key 359. Therefore, as shaft 484 is rocked clockwise back to normal, arm 905 will be rocked counterclockwise and by engagement with the upper side of the pin 369 of right shift key 399 will pull said key downwardly (Fig. 3) and latch it in depressed position, thereby initiating a right carriage shift.

Furthermore, as the clear-out cycle is completed, the arms of bell crank levers 413, 414, and 415 (Fig. 3) will be moved to the left and therefore lever 612 will be rocked clockwise by its spring to normal, thus removing secondary latch 6H from engagement with lug 610 of primary latch lever 598. However, when rocker 591 (Fig. 19) was moved counterclockwise, the outwardly extending arm thereof was moved to the right (Fig. 3) of recess 593 of primary latch lever 598. Accordingly, when lever 598 is released by latch 61 I, the lower edge of the lever 598 to the right of recess 598' will be brought to rest upon the outwardly extending arm of rocker 591. Thus lever 598 is held in rocked position.

Carriage 2 will be shifted to the right until a lug 4')! (Fig. 15) of a set tabulating key 402 is moved into contact with plunger 438 (Fig. 14). 

